APPENDIXG. ALARM LIST
B–64124EN/01
884
Overtravel alarms
No. LED display Description Countermeasure
500
The positive stroke limit has been exceeded.
Check whether *+OT and *–OT are connected
correctly. Check whether a correct move com
-
mand is specified. Move the tool in the opposite
501
The negative stroke limit has been exceeded.
mand is specified. Move the tool in the opposite
direction in jog mode, then perform a reset.
510
The positive soft stroke limit has been exceed-
ed.
Check whether appropriate values have been
specified for parameters No.142 and 143
.
Check whether a valid move command is spe-
511
The negative soft stroke limit has been exceed-
ed.
Check whether a valid move command is spe-
cified. Move the tool in the opposite direction i
jog mode, then perform a reset.
System alarms
No. LED display Description Countermeasure
–
An error was detected in the RAM write/read test
at power–up.
Replace the servo amplifier unit.
–
An error was detected in the data collation
check for the non–volatile memory.
Turn the power off then back on. Then, re–enter
the parameters. If this alarm recurs, replace the
servo amplifier unit.
–
A data transfer alarm for the non–volatile
memory has been issued.
Replace the servo amplifier unit.
–
A watchdog alarm was issued. Turn the power off then back on. If this alarm re-
curs, replace the servo amplifier unit.
–
A checksum alarm for the control software ROM
is issued.
Replace the servo amplifier unit.
–
A checksum alarm for the ROM that is built into
the CPU is issued.
Replace the servo amplifier unit.
–
An error was detected in the control circuit. Replace the servo amplifier unit.
I/O link alarm
No. LED display Description Countermeasure
–
A FANUC I/O Link error occurred. Any unit con-
nected to the line was turned off.
Turn off the power to all units connected to the
line. Then, turn on the slave devices, followed
by the master device.
No LED display
No. LED display Description Countermeasure
–
No indicators
lit
The control circuit is not operating normally. (1) Check the 24–VDC control supply voltage.
If the voltage is low, increase the voltage to
an appropriate level.
(2) Check whether a fuse in the servo amplifier
unit has blown. If a blown fuse is found, re-
place it.
If (1) and (2) are not the cause, replace the ser-
vo amplifier.